Heating-generating plant



w. T. BIDWELL. HEATING GENERATING PLANT. APPLICATION FILED MAR 15, I920- .Z) L M d man 11 m 1 M F N 1W7 T mm M n w m.

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HEATING GENERATING PLANT.

APPLICATION FILED MAR. 15, 1920.

1,391,45 1 PatentedSeph 20, 1921..

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' 1,391,451 PatentedSept. 20, 1921.

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w u rHomAs BIDWELL. or ATLANTA, GEORGIA.-

HEATING-GENERATING PLANT.

To allwhomz'tmdy mm Be it known that I, WILL AM T. BIDWELL,

The main object of the present inven tion is to provide a bridge-capable of withstanding or resisting high temperatures. so

that the life of the bridge and in consequence;

the heating plant, willbe increased thereby. A further object of the inventionv is to locate the steam spraying pipe of the smoke consumer within the heat resisting bridge and to provide said bridge with means :for

permitting the jets of steam to'issue' therefrom.

With the foregoing objects outlined and with other objects in view,which will ap-' pear as the description proceeds, the invention consists in the novel features hereinafter described in detail, illustrated'in the accompanying drawings and more particularly pointed out in the appended claims. Referring tothe drawings I Figure 1' is a perspective view of a steam generating plant having a portion of its wall broken away to exhibit the construe tion and arrangement of my improved smoke consumer and bridge. 1

Fig. 2 is a front view of the novel bridge frame and the damper for admitting or controlling the feed of air to the bridge.

Fig. 3 is top plan view "of the construetion shown in Fig.2.

Fig.4 is a top plan view of the bridge,-

the crown'bars of the bridgebeing'removed to exhibit-the steam feedingpipe of the smoke 'consumerr Fig. 5 is a sectionalview takenon the line 5-5 of Fig. 2, but showing therefractory' coating' of th'e bridge.

Fig. 6'is' asectionakdetail of the crown ceive locking members 25-having dovetailed grooves that receives the keys 24: and locks portion of theflbridger Fig. 7 is a longitudinalsectional view'of the bridge taken on line 7'7 of Fig; 5. Fig. 8- is a fragmentary perspectiveview of thc bridge.

Fig. 9is'aperspectiveview of one ofthe 7 theframewhiletheyupperend of-the inem----- crown. barl'. v

Application-filed March 15, 1920. S'erlaLNo. 365,916.

tles.

. Fig. 10 is a similar view of one of the Specification of Letters Patent. -Patei1ted-Spt, 20, 1921 I I locking members used in securing the two sides of'the bridge proper together. In the drawings, 1 represents the casing .or-housing of a steam generating plant in which is located a horizontal tube boiler 2. Locatedbeneath- -said boiler is a bridge '3 Whichis spaced away from a vertical baflie .4 that depends'from the boiler.

isprovided with a supporting bar 5 which I supportsthe rear'ends of the gratebars'6i The bridge proper is supported upon a of the trestles and secured to the same, is a vertical plate '8 having an 'air opening 9 controlled; by a hinged damper "10, provided with aseries of apertures 11* to insure a certain quantity of air being fed to the bridge at all times. The damper is operated 'Mounted on the trestles, are two rectangu-v lar, hollow metallic air feeding bridge "frames 14 and 1 5, each of which is provided at its ends with key-ways 16 which key-ways provided at the tops of the tres- Thesekeys act to -lock the frames 14 and to the trestle 7.

Each of the frames is provided at its up- -per edge with a plurality of longitudinalflanges 19 and 20 which act as keys for the crown bars 21 and the front and rear sides of the frames are provided with dovetailed verticalikeys 22 whichfunetion to reinforce the frames and act as keys for locking the refractory plastic covering23 to said frames. The ends ofthe frames are also provided with taperedkeys 24,"which when the'two frame members are placed end to! end,- rethe two frames to ether.

tends across the interior of each of the hol- The bridge plurality of trestles 7, there being'three tresv tles in'the present instance, but this number may be varied in larger or smaller sized 'heatingplantsILocated on the ash pit side by a rod 12 which extends to the front of the 'casing'l and has a handle 13 to be engaged receive keys 17 that are slid into similar low bridge frames and functions to reinforce that the spaces formed thereby, act to provide apertures 32 to permit steam from the pipe 29 to pass to the rear of the bridge The pipe 29 is provided, at its ends with threaded fittings 33 which enga e extensions .34 of'the pipes 35 and 36. pipe 37 is connected to the steam dome 38 of the boiler and extends forward of the-furnace casing. Its front end is connected to a vertical pipe 39 which passes down the front of the'casing and has a control valve 40, 3Jldih8 lower end of the pipe 39 is connected to thefront end of'a pipe 41, the latter pipe being connected to the lower end of the pipe 35. A pipe 42 is connected to the lower end/of the pipe 36 and extends to the front of the cas ng where v cock 43.

it is'provided with a drain In operation, air passes in beneath the grate 6' and movesrearwardly through the opening 9. There the air is deflected upwardly by means ofja forwardly and downwardly inclined refractory plate 44, which is supported by diagonal struts or'inclined bars 45 forming art of the trestles. The plate 44 directs t e air upwardly through the air passage ways 46 in the bridge frames 14 and 15 and the air passes. out' of the bridge through the apertures 32.

Steam from the boiler passes by means of the pipes 37, 39, 41 and 35 to the pipe 29 and'this latter pipe is provided with steam apertures 47, which are arrangedvin series running in a straight line longitudinally ofthe pi e 29. v The pipe 29 is formed of copper, erman silver, Monel' metal or similar non-corroding, high heat resisting material and the apertures 47 are of a diameter not more than one-thirty-second of an inch.

It has heretofore been proposed to form: minute apertures in the steam feeding pipe, but as the pipe was formerly made of corrodable metal easily affected by the highly heated gases and steam, the pipe 29in cor-- roding caused the aperturesto-be closed and this affected the efliciency of thesmoke con sumer. By making'the pipe 29'of amaterial capable of withstanding the highly heated gases and steam without corroding, the apertures 47 will remain open and in. consequence the smoke consumer will operate thesame at all times.

It will be noted that the 29 ny rests on themembers- 27 an 1s not con- 'nected to any part that is fixed. It will 15, slots 49 provided in theinner ends of the end keys 17 ,and slots 50 provided in the upper portions of the end trestle 7. This construction will permit the pipes 35 and 36 to expand or contract without damaging said pipes.

The steam" from the pipe 29 may be directed nearly vertical throughthe apertures J 32 or nearly horizontal through said aper- 1 A The battle 4, as before stated, is arranged a distance from the crown of the bridge to 'i r 7 provide a throat 51-which will belbounded tures, by simply turning the fittings 33.

on the front bythe bridge, on the rear by the lower endv of the baflie andon the-sides by the inner surfaces of the side wallsof the casing. The lower end of-therbafl'lef from the fire box, will be directed into close proximity to the air and steam issuing from the bridge and thisconstruction will cause the gases'to travel in an S-shaped path. The.

baffle is preferably ofv refractory material.

and it is-preferably provided with air pasterior of the plant to cool said baflie.

In making up the bridge a foundation is' first prepared a suitable distance back from the front of the casing, to receive the trestles 7, the frames 14 and 15 andcrown bars 21 are subsequently placed in position, and then fractory material extends from the grate bars 6. to a point at the top; of the crown rear of-the bridge extends upwardly only "sage waysj52 which permit air from theexplastic refractory material is placed on the bridge. In the front of the bridge, this re- 7 V bars, while the "refractory material on the; 4

to the lower walls of the apertures 32-andv this plastic material acts to protect :the bridge and prevent excessive heat from reaching the interiorof the same.

The'refra'ctory baflie 4 and throat 51 while shown asfvertically arranged, may be an ranged at any suitable angle relatively-to the bridge, the; objectin any casebeing to form'a throat for the passage of the-'gases and to provide a hot bafiie toreceivethe jets ofsteam issuing from the apertures 32.1 The I bafile is supported by the side walls of th furnace. 1

I The rear ends ofgrate ba-rs 6 shown as supported by the bridge but'it will be understood that other-means for support.

,1 ing the grate bars may'be used without do' parting from the invention; 1 In certain types of boilers the trestles may j f be substituted by other. supporting means and I doznot wish to confinethe invention to supporting the bridge by trestles alone.

While I have shown and described the steam pipe 29 as supported by special fit tings within the bridge and the pipes 37 39 and 41, as extending forwardly and down the front of the boiler, it is obvious that steam may be fed from the dome 38 through a pipe extending down the side of the furnace wall and through the'wall at this side, to the bridge.

The pipe 29 is formed of suitable metal which is non-corrosive under heat, so as to maintain the apertures 47 unclosed at all times. i

I am aware that various changes and modifications may be made in the construction shown, without departing from the spirit of the invention as set forth in the following claims.

What I claim and desire to secure by Letters Patent is V 1. A furnace bridge comprising a plurality of parallel trestles spaced apart and each provided with a forwardly and downwardly inclined bar, an apertured plate arranged across the front ends of the trestles and the aperture of said plate having its'bottom edge arranged in alinement'with the lowerends of said inclined bars, a damper for regulating air passing through said aper-' ture, a forwardly and downwardly inclined air deflecting plate supported by the inclined bars and having its lower ed e arranged adjacent to the lower edge 0 said aperture, a hollow bridge body supported by said trestles and having an apertured crown,

said body being arranged directly abovesaid inclined plate so that air passing through the aperture of the aperture-d plate is directed upwardly through the apertures in the crown of the bridge body.

2. A furnace bridge including supporting means provided with u wardly opening dove-tailed channels, a ho low bridge body carried by the supporting means and havg downwardly opening dove-tailed channels, and double dove-tailed blocks fitted in said channels and functioning to lock the bridge body to the supporting means while permitting expansionand contraction of the bridge body relative to the supporting means.

3. A furnace bridge formed of hollow rectangular body members arranged end to end, dove-tailed keys arranged on the outer sides of the body members, locking members having dove-tailed grooves which engage a plurality of the dove-tailed keys of the body members for locking said body members together, and masonry refractory material molded onto said keys and said locking members and covering the opposite sides of the bridge body.

4. A furnace bridge including supporting means provided with vertical slots, a hollow bridge body carried by the supporting means and provided with vertical slots arranged in alinement with the other slots, an apertured crown for the bridge body, said bridge body being provided with vertical partitions having grooved upper edges, an apertured steam pipe resting in said grooves and unsecured to the bridge body, a pipe for supplying steam to the apertured pipe xtending through certain of said slots and secured to one end of the apertured pipe, and a drain pipe secured to the other end of the apertured pipe and passing through the other slotsin saidsupporting means and bridge body.

5. A furnace bridge comprising supporting means having an apertured plate, an inclined air deflecting plate carried by the supporting means and having its lower edge abutting the lower edge of the aperture of the apertured plate, a hollow metallic bridge body carried by the supporting means and arranged directly above the inclined plate,

a removable metallic crown fitted to the upper edge of said bridge body and provided with rearwardly directed apertures, a covering of masonry refractory material molded on to the opposite sides of said bridge body and covering substantially the entire front half of the crown, and a steam pipe arranged within the cIOWn for directing steam through the apertures in the crown.

WILLIAM THOMAS BIDWELL.

including a body 

